She is the younger sister of the former fugitive Prime Minister of Thailand, Thaksin Shinawatra.
She will face the immediate challenge of bringing stability to the kingdom, after five years of political turmoil since her brother was thrown out of office in a 2006 army coup backed by Thailand's elites.
After her selection by lawmakers, the country's 28th prime minister can expect royal endorsement within days to formalise her position.
Analysts believe a key test for Yingluck will simply be whether she can hang on to power in a country where the removal of leaders is commonplace.
The meeting to elect the new prime minister started about 10am, chaired by House Speaker Somsak Kiatsuranont.
When it came to the agenda on the election of prime minister, list MP of Pheu Thai Sanoh Thienthong proposed Ms Yingluck for the post of prime minister. The nomination was supported by 294 MPs.
She was the only candidate. The opposition did not nominate a candidate for the top job.
Good Luck to you Yingluck... and your name itself brings luck...
Have a nice day, Thailand......